Learn Turkish: Kapağı reddettik çünkü üzerinde çalıştığımız satırları beğenmedik. - We rejected the cover because we didn't like the lines we worked on.

This uses a postpositional relative clause, which is the focus of this lesson. Instead of using a relative pronoun like "which" as in English, Turkish takes the postposition üzerinde (on it) and pairs it with the -dIk participle form of the verb. Here, çalış (work) becomes çalıştığımız (our working). Together, they modify satırları (the lines), giving us a literal structure of "its-on our-worked lines."

Why do both kapağı and satırları take the accusative case here?

Both words are the specific direct objects of their respective verbs. Kapak (the cover) is the specific item being rejected (reddettik), so it takes the accusative suffix and undergoes consonant mutation to become kapağı. Similarly, satırlar (the lines) is the specific thing we didn't like (beğenmedik), making it satırları.

Why is there a double "d" in reddettik?

The verb reddetmek (to reject) is formed by combining the noun ret (rejection) with the auxiliary verb etmek (to do). Because ret is an Arabic loanword, its final consonant both voices (changes from t to d) and doubles when it merges with an auxiliary verb starting with a vowel. We then add the past tense -ti and the first-person plural ending -k.